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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e8ef7962b85c0ca1cd9000f3aff1572000e0627ef3fedcef0624777bfeb71c9' 
  AND token = 'RZsqW7eEuHTj6m9yLwKz+DLy34U66oFYPlR3lpY83tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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