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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd23d89fb2a26bf307cfa26afe4d87a58b15922b2c2810b088d7cb3c7cce3027' 
  AND token = 'CuSV6tXBgHV1IjiuZEOm805rwvhuvGcD07hpf7hOt9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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