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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2324235d8810f9bc355c0331f4d234f074108865af080a697aaefdb68d8ab5b0' 
  AND token = 'i+TZ+UGeFuJGpy45J83W1G5lWpEzuzzwy829wDtLp44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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