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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d6dded023fa27255025720e2534b7795016031d052377c75a12e8e0d9e15ad' 
  AND token = 'vJoYgGoNf7BqDejErgsFmk2PY4H/3w9YEhRXegh1Eqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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