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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca8ef13ad6ae43350f40ae01fde7373ea79be3a793572f21803f8f86b0686054' 
  AND token = '08hBGfLSHK+xVBGy4tDk0ufmsTdqF5BXdP/vjnCraHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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