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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b69980f777aefb5077054a2634d1c11d31d0061ae8b469cd08b39ce7c348ccad' 
  AND token = 'lcFQbY2v//dkZxHJi6eK97mw4cIjKCcLcadJwnJDRBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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