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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e53c132e79bc3a6fc1098cb7e8ae5b5e929359c84631dcf69809d87bbaa47e4' 
  AND token = 'UJ3QKTOhUIdoP0dqtJZQSEAPG0Gs7m/dSdpzOoq1+SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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