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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd95e20cbee8ec2715fde4eae837df4ef61eec24c3adcdc99355fd0782c771923' 
  AND token = 'fjfqTczpgXad1t11H7if6SN7H26ydbKSP/sKQ6x/N/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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