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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '963d64a7739d0513b27b30623219d1698d8ccc1e4518bda1ec381023de382d9d' 
  AND token = 'JfIMcdvvG5MIUjaW4ODpsc7fQvklxudPt2GWdCycirk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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