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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5858d0b7dd7502c186b7e6c08166fdbbcb02ac05f8ef3ed9ed68931278b37068' 
  AND token = 's7ECjkPflhIhFM2dHP0Kw8YHI9++LtDADWKyKouJJ7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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