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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a847f1e1857d62fb0067e61e9acf6ee26a172547282ab5bd252372b9001eee' 
  AND token = 'qosSdGx7rvbssboo1MpGpe2S1t6/x4EPjH6JWv2JRr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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