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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '132beb000eacaf610e2329ae9f1dd9cbff484220b239195a54618f49bac861b9' 
  AND token = 'ao7WkCKx11rzCe25an07adAoAKGM5srByKAOEM0bB6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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