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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a96b5e4fbafd66273fef792dcb1cb22659be77ad5cdacbfc14d5d28d20a802e1' 
  AND token = 'NrTZFlK6Fp5CcFrbjFv1r0HTw3nTCgokasnzNM41xj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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