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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '828ad19c7db66ee0c589bc4a1fa4823cd621cd3b6a19154e5e83021a10d944b5' 
  AND token = 'Nx5R4wFph0ANpBKPFJOflevQ23bmMJocwC6WbIgXFmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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