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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bc294226f812989877d3a18dfe23e96a0abd681e165f54748a4721980098fac' 
  AND token = '0dBbPItDD/djZJo/9OA3ZIQW7R0ulc3dGoY6xfFQisI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}