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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73a2e0972060ff36c5985abfc731a8be9d9103b2986b6f3e4fb664b8382f742c' 
  AND token = 'KwJk79oqpaMwfweYQANdQcmMvnANn8k8mHCm34ZUQVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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