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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae0eaea0097d3ac530df204a94d6543c0c1c768bc0482e2382aab3b4f68ed87' 
  AND token = '3nQdJrzc+w2tCq4HQC9rL8YDyrex7jyZvQufnjHoFBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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