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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81b6874e8c9cf6a52b7a1f54530b830a1dea501c817ca4853837bcd209ad16de' 
  AND token = 'V86UHv9kulvb57R2xwUXr9u3MuMuKPZ63VmrXv9wlxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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