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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1444aced4097b35a6279801c811cdc93a8e86a8c2380faebf64f765c8879185d' 
  AND token = 'xIDIADiW80ANZQMTDZ+jFgWJEckVDiDXa6z6Psf1RdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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