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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b998f404441fa1575f0140eb52f2e6dc18def26e233039f8e9e33c19bd513f82' 
  AND token = 'cd53gkeICzXKBzh6dAOJ3gEayf8IA2sRjIQ0kCC6s4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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