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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01541d8a96b3991ede283e135e38a9aa7e88f7bfbf3a93caa82aeb86dc08924b' 
  AND token = 'K6VznaGwjCAbwgBqJc7Tn8C/Ksf7r6cH0tGiTsm1+Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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