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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24eae3ba228cb525f004db91c9cfddf88f0305cb31bec610fc745aff487dea30' 
  AND token = 'd3unMBxUI/iTjr2s0wzPLLaTwgXTK+c0AsCv4FXIGR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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