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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d790e4d05ecea2da5bd28fef3793e8457e552f82cf36c4ce56ce2ce8d83bcc' 
  AND token = '9crK1fnyK5k8LQUuohSfoulbZ4o5VHbFvBEOzvYbwZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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