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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e63a81d43188706d5b759f30726c93d83519b769b024e3b5eeec3ebfa480ba' 
  AND token = 'SSzPFfqqE3XkUVWM5p76LuV/VpZLazLIPgEsy8H8vws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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