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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41a22bf1235d894353e6deb3ea7c956de455f6a63e6ad9cb992cae27a85fcb0a' 
  AND token = 'RTJXfT6WA/Al3ZGueItFdEGXHtpf6asdalDtgHQ2IKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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