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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7528e2bc0d69bb71268ba6db19e701f34524f6bb19d57783b6e403aacee030e5' 
  AND token = 'AWGuuAS4ovKVaRSdnyHvEWYljkh4M3+04YjB3fowKFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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