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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b85fc94eabee8bef466ea24c600bd0bb2db1b747333df4c9122194bf10a6e39d' 
  AND token = '9EbA+1GbsI7lAvoibK2BsWU6RB5z2c4rVbshHMHzi9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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