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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b24a3a518e9ed12ec56592f14fe37f604e1013282439e9791a8260407986fc92' 
  AND token = '7Hku57J6+4cfqyqpUJJF4Tnvs1Srx7CQodwkhu7leFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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