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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34df7b92dd64637b9fb230cd2961d67801e76d33ff2aa4687e9324a65387dbad' 
  AND token = '+gyvL89ARM0CUT562dEdPj5hqbMQmc9Cma5WujJsmbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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