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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cf7b78eb138431f90ed67f6312e737c82037ad18ca5f51cf7c205c2a7176f97' 
  AND token = 'i6Lny4I2yb0C9oEkK6T699kry0wTjmZOAvPDbllcfUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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