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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b787cfab7b64c90499ca3e42650b85a8e01e1d9f9cd47d86c8a56c43e0afd6cf' 
  AND token = '1d7/cV/X6lysQeAc4jVli4AXSmqCYBSU+RuNCPR3qqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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