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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275eb216789dcd662bb924c4df4b6403fc1fabc5d9aa3b24547143a3ff58cfa4' 
  AND token = 'ctiDXcSXN11bVryTUkxNgDnzwBwjThNA9ADvofc+HH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00747

JSON explain

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