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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5fa34f3f30ec6e298127ee80a0c8595cb7258b15e1a9e47bcd994ddfae10eed' 
  AND token = 'JluanlSUxhUA0b8cEUG3AMiRYnO69cuH5r8BJAYqEy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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