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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a5a15cd85ecdf5265c0b0ea8d706a5e2bc59d54656cceb8b5b869b79783e37e' 
  AND token = 'P8W0JmG7R0hvAcESYqS8x+b13A9UQfDIYUdcxs7+aa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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