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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '371856696e633551530e9f4a52f8e06404024368b407f0a5289cf7c1833b2df4' 
  AND token = 'ZZU2aIC3PaezY6zkhoPB1CJtNp45+CGG3w8HKovct24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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