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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fa2e4763ac9f3fa96aa11f992c1877c4a4e70c9dac9d3c2141e29a87db1c7d8' 
  AND token = 'aflIbDilppHmWEUvdw/idCH5Si5Mg5Ku9NBYrT5MxkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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