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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bedafa5cbf8add4d5be589deebd912e66e048821db6095b5c47a92f2407f7b90' 
  AND token = 'FUHMafvjspGy+wj646GkYLzbbs58WRpq5MS+GqI4w+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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