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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad769990a5608c0e61a343513d705d58834657cc12a3ed366b0a7887411bb87' 
  AND token = 'HtYfP05i83J9XPL0aVgSF+aiFF7INfoK7jzOh7QOnmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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