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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83cd88e9f8731bfffc917c82f2c5e38e80add4daac7035d87738be87312af5e8' 
  AND token = '9w+AQcGB251UGNwh1HdgJmE7DEt4KlnmOgJql3/1Z4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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