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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0e912ec11690e00736b45fb2fbdbed5a74df18fa62a0270297608e6e3679c5' 
  AND token = 'dKSOD5SOTuBnx0HvB4NPowo1WxkiMtT0KXRkMp1ICTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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