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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '772cca8ea482f10d2580607d47b1a68600660d279070da0b687fd2ed7731541f' 
  AND token = '3FsSW86jueEUwXOTP2jMKbQoLTnwV/dXHqzIdBDdlOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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