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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5ab47c5f37b807f6d2532d6e3b83aa2cdf1555a1f5ef854bc95a5bc55b31276' 
  AND token = 'obV0mtg0C5vH4HglF66m8v7bGDZGTHZCQ9qY62Dv2NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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