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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c665a74b751ccbc89058a42ae3b1affb9855ec982bc35dc7aed7d326214e97f' 
  AND token = '3gLoYW9FNMcuimOytrcKoxHqLWyrzoxYG+huBkW77iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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