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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '861ffb5f531168b857757103d5f6e9c60f0b1c461c70a1af00077653571847e0' 
  AND token = 'v28j50L+S/Q8RUqQTiMVZwOhHfphGlMMx3N4C9phis8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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