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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c17f1ef6a9764513c6f74932e790421f950e0ea5d2d489acb71a5d782f01b7' 
  AND token = 'GV2G2yOZxNtHr52JVgF9rkuZGUZF0tBy2FEmWefRk0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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