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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc01770dc175340a5d1a1c1dc30a3e6c44290f58cf78c59919cfa5109006f66' 
  AND token = 'xmod1nQBstGdTxgsclDjPy6FWslw6ZFuwh9fa+E0ppk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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