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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ebf3ed349f9bd0e2f4f9a10bb3fffe310295bd4910372ba2370259a153a3112' 
  AND token = 'OFm0nTlhs186/jhzDZvsQsM3tkK8gJXZYk9GjNYzD9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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