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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93bbcc8787b4b486eda02b3e55c7d5f2432315f083a2630f7d034ad07c96a046' 
  AND token = 'C6teDFspKPMvi4FIhRenlu65h1PsCCHtE95lZSUJld8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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