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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '264876c1f18246d202e5dc447e5d5916166af32f63fc58ee19d350503931c44b' 
  AND token = '8oT5+MV/97njFkiM1iNji1CMgAxxeNJ4brz7dTTisK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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