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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65c5bdcf77f0af0c6ed87fe8a8995b56408c00cf08aa1dbab6635b80a228416d' 
  AND token = '7Iv7cUzSqylan2EygSlb9/+/A/EyiEhkfDFX6MbEXOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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