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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d744d3b56d3d0413184888bd434d86e69d4b4fb5afd6abb3a34bc6842147039' 
  AND token = 'yNpfkhIw5urDX+GZyOnEl/6pIVVShdN9cJYCCetnvOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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