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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c8039ecab177c02808c3e6186c8a6f19a69cb651719174a0e1fc7b41e7763c3' 
  AND token = 'kO7pn0LXEWNSo9psz+gWZNcyd+93i5WDRm2cqpP9acc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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