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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff853113215ac6123fbaaa7e04ad9200f32cf7fd8d41f1499976533b90775e27' 
  AND token = '3H/z+4mqvBC4vSB4IRynyhl/M0QJei+i0iByIlSnZQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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