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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80763afc2c0f6252ac94e386bce6a4960f15ba153b95058faddd35664f33d930' 
  AND token = '3JkC0qWgk3nVpoiD3V5yBO6kH/cwWmPh5QsEJ5IbwfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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