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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d31b9516b07b06154beea3d7cb63d1f6cd7343d24291a0783cf0622f072ae2' 
  AND token = 'u9XZzbIvV0rWYntVnUBaKwbGR6Q1FUjsOzrGcrIkyI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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