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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '587f1baf6be551412c2b902e419c767c481fc75bc5ac2127af522e6abb6f2ee9' 
  AND token = 'woeEAEZIs3sYflDW68DfTFzjPeWNp9Q5wx6r0iNKlgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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