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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96fcc5ffe662f782693a5fdff8da1a97ab40c798f59b4ab72d699eaccc12759b' 
  AND token = 'u/6DHXJ+uiR79NnYP/c/Bi/ZwRbZoY4m/GfilJTK2TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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