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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ff40f3e16e5184a0dd8e0ced54ef7fe9f7ccdd32e196f2f5c20b4dcc4c1f1f' 
  AND token = 'kxFLtcJwHWOXe7VIzMfRitL2J7h5wsWf8ZN7SE+CcRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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