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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47645e508b242a6073725e0d7299f7557750f840254d1bfca408dcdf3245eef8' 
  AND token = '8mMbRU0HyCju4TErnLhhO7M9ZzIA+SGH1DWlSnP33h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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