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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'badf88e58d86fea6834e9af0fc57cffb1538a47f1adc40375e6e2735068aef64' 
  AND token = '+5lbDVaPXmmOfsSrecJTtzoWy53bX0BgWd8DX3/fmXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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