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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1293a9a1a6c5b6fbf05cb016dcf422cfc09f093f7a5f24d6a3a381c49d1f551' 
  AND token = 't0qjzhKQ8MH5kMx2pPdKtHeUV6LZViMw4Bk4IQMpm2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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