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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d6ce43bea85397120a0e28befe7e5a48e46ad8ce8bc8e763bf5452e8426e47' 
  AND token = '6USwaG5NIld4NVxM5Kbc6VbW0CCZ3reMXLlxQravfVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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