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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95b57a1d1ac47883439d1b5b96a96c14d5adb312b0e4544cef015128de6d7ade' 
  AND token = 'fjzY8bT8EvjYlYNfi57YdsE/yQxnjATV8+Qz/crXhbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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