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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c5daa83536b153cce93bc63ad494799f09fd31cfc90e594101432d4fe9ee68' 
  AND token = '/0mbT/+SZZvTJkDGGieOeAtdWSC2r8x4i98hPhyuYXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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