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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c79a6eef94862a5461768dacf8de007d5c446c9eb161c57b48f11ec0b2e6134' 
  AND token = 'tFWc3HNMkZmDMnkJnPAhSUOr6Uk8xOUz5mvBIWx8OAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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