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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa14b88bbb4e00ff1ac2dd76c95e567679c7396a84aeac87357577a04ce3c6e6' 
  AND token = 'm8lR7RSrq+v2UyAkbb0Oo9skhOXl+WQ5SKuIrvxPtzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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