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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e73db8fb0710dd3baf99c01ca6638bdd07303e5552ba6b2f2a52f2d9bb1c32' 
  AND token = 'hHKzMSyRlh51D9nf7p4cdju0bqsgtpMiQr2qJvVQTcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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