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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f42b2ecd5b61deb28231e4cc89756938d66686e2423ccd741b89aad8345a9b0' 
  AND token = '/mu0l+19a5cSKpbf8gBguzA/OlQh+t4EDTKSSK8MyUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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