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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e31a350b0fcefeb52a2a55a4cb164add05a9d14b7ae54d178b00a24a2349706' 
  AND token = '/s+nEKhmrKBwKUoyd+wXeopXCrrVS0syVjygQs9kc8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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