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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8d950d5d499a46c7f7512c6a8ad3ab16666cdacd0e8d325f61500b0a49cc81c' 
  AND token = '9hj/79mS/TantR/VDjyinuaxEdwE+DbvkgReKBlmk7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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