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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0e33ddb5433a0ee070cc9c6782d7b7fdbfa47db8277252579220c66a309c3ad' 
  AND token = 'i1joqpmGhR6Ze92WSX7PVzNaCuN2gFcDqd3Y8TuZiwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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