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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac23848cdd83da621a5f6892fb10fdac3f83e46734f35dc328903bccaca85807' 
  AND token = 'lYbofdW62FOYhN3Lc++vmgO12KMVR++6h+d73jv70KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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