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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79b2b59788cf183154ed264ecc8908a053649a910a8a873ab1d5123e5bc85d2' 
  AND token = 'GAzXhmnBmXfkBMrH0SGZFI2i5eOmzMev4wVRQyLA1GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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