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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e29e89e22b40565397a28a5e4bdfbb010d739a6ce4c94b7a26489c80c3cd5f7' 
  AND token = 'FXCP8KrrLhNrxOm31/oZbs5EyNzzPj+AbavOh4uczgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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